Gallons per Square Foot Calculator
Find how many gallons of liquid it takes to cover an area to a given depth — handy for epoxy, sealers, pond liners, and water features.
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How the gallons per square foot calculator works
Gallons = Area(ft²) × Depth(ft) × 7.48
One cubic foot holds about 7.48 US gallons. Multiply the area by the depth (in feet) to get cubic feet, then by 7.48 for gallons. At 1 inch deep, every square foot holds about 0.62 gallons.
Frequently asked questions
How many gallons are in a cubic foot?
About 7.48 US gallons fill one cubic foot.
How many gallons per square foot at 1 inch deep?
About 0.62 gallons — one inch is 1/12 of a foot, so 7.48 ÷ 12 ≈ 0.62 gallons per square foot.